CSS Gradient, color-stops only
CSS gradients do not need starting or ending values
by desandro
HTML
<div id="grad"></div>
CSS
#grad {
width: 300px;
height: 100px;
border: 2px solid;
background: -moz-linear-gradient( left, red 25%, blue 75% );
background: -webkit-gradient( linear, left center, right center, color-stop( 25%, red ), color-stop( 75%, blue ) );
}